Documentation: Add documentation for -chardev
Adds documentation for all -chardev backends. Signed-off-by: Matthew Booth <mbooth@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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Matthew Booth
Anthony Liguori
parent
eeb4a3bae0
commit
7273a2dbcc
234
qemu-options.hx
234
qemu-options.hx
@ -1085,8 +1085,237 @@ is activated if no @option{-net} options are provided.
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@end table
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ETEXI
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DEFHEADING()
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DEFHEADING(Character device options:)
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DEF("chardev", HAS_ARG, QEMU_OPTION_chardev,
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"-chardev null,id=id\n"
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"-chardev socket,id=id[,host=host],port=host[,to=to][,ipv4][,ipv6][,nodelay]\n"
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" [,server][,nowait][,telnet] (tcp)\n"
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"-chardev socket,id=id,path=path[,server][,nowait][,telnet] (unix)\n"
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"-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr]\n"
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" [,localport=localport][,ipv4][,ipv6]\n"
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"-chardev msmouse,id=id\n"
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"-chardev vc,id=id[[,width=width][,height=height]][[,cols=cols][,rows=rows]]\n"
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"-chardev file,id=id,path=path\n"
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"-chardev pipe,id=id,path=path\n"
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#ifdef _WIN32
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"-chardev console,id=id\n"
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"-chardev serial,id=id,path=path\n"
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#else
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"-chardev pty,id=id\n"
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"-chardev stdio,id=id\n"
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#endif
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#ifdef CONFIG_BRLAPI
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"-chardev braille,id=id\n"
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#endif
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#if defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \
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|| defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
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"-chardev tty,id=id,path=path\n"
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#endif
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#if defined(__linux__) || defined(__FreeBSD__) || defined(__DragonFly__)
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"-chardev parport,id=id,path=path\n"
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#endif
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)
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STEXI
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The general form of a character device option is:
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@table @option
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@item -chardev @var{backend} ,id=@var{id} [,@var{options}]
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Backend is one of:
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@option{null},
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@option{socket},
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@option{udp},
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@option{msmouse},
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@option{vc},
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@option{file},
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@option{pipe},
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@option{console},
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@option{serial},
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@option{pty},
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@option{stdio},
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@option{braille},
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@option{tty},
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@option{parport}.
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The specific backend will determine the applicable options.
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All devices must have an id, which can be any string up to 127 characters long.
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It is used to uniquely identify this device in other command line directives.
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Options to each backend are described below.
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@item -chardev null ,id=@var{id}
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A void device. This device will not emit any data, and will drop any data it
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receives. The null backend does not take any options.
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@item -chardev socket ,id=@var{id} [@var{TCP options} or @var{unix options}] [,server] [,nowait] [,telnet]
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Create a two-way stream socket, which can be either a TCP or a unix socket. A
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unix socket will be created if @option{path} is specified. Behaviour is
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undefined if TCP options are specified for a unix socket.
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@option{server} specifies that the socket shall be a listening socket.
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@option{nowait} specifies that QEMU should not block waiting for a client to
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connect to a listening socket.
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@option{telnet} specifies that traffic on the socket should interpret telnet
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escape sequences.
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TCP and unix socket options are given below:
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@table @option
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@item TCP options: port=@var{host} [,host=@var{host}] [,to=@var{to}] [,ipv4] [,ipv6] [,nodelay]
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@option{host} for a listening socket specifies the local address to be bound.
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For a connecting socket species the remote host to connect to. @option{host} is
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optional for listening sockets. If not specified it defaults to @code{0.0.0.0}.
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@option{port} for a listening socket specifies the local port to be bound. For a
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connecting socket specifies the port on the remote host to connect to.
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@option{port} can be given as either a port number or a service name.
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@option{port} is required.
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@option{to} is only relevant to listening sockets. If it is specified, and
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@option{port} cannot be bound, QEMU will attempt to bind to subsequent ports up
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to and including @option{to} until it succeeds. @option{to} must be specified
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as a port number.
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@option{ipv4} and @option{ipv6} specify that either IPv4 or IPv6 must be used.
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If neither is specified the socket may use either protocol.
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@option{nodelay} disables the Nagle algorithm.
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@item unix options: path=@var{path}
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@option{path} specifies the local path of the unix socket. @option{path} is
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required.
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@end table
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@item -chardev udp ,id=@var{id} [,host=@var{host}] ,port=@var{port} [,localaddr=@var{localaddr}] [,localport=@var{localport}] [,ipv4] [,ipv6]
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Sends all traffic from the guest to a remote host over UDP.
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@option{host} specifies the remote host to connect to. If not specified it
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defaults to @code{localhost}.
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@option{port} specifies the port on the remote host to connect to. @option{port}
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is required.
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@option{localaddr} specifies the local address to bind to. If not specified it
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defaults to @code{0.0.0.0}.
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@option{localport} specifies the local port to bind to. If not specified any
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available local port will be used.
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@option{ipv4} and @option{ipv6} specify that either IPv4 or IPv6 must be used.
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If neither is specified the device may use either protocol.
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@item -chardev msmouse ,id=@var{id}
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Forward QEMU's emulated msmouse events to the guest. @option{msmouse} does not
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take any options.
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@item -chardev vc ,id=@var{id} [[,width=@var{width}] [,height=@var{height}]] [[,cols=@var{cols}] [,rows=@var{rows}]]
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Connect to a QEMU text console. @option{vc} may optionally be given a specific
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size.
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@option{width} and @option{height} specify the width and height respectively of
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the console, in pixels.
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@option{cols} and @option{rows} specify that the console be sized to fit a text
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console with the given dimensions.
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@item -chardev file ,id=@var{id} ,path=@var{path}
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Log all traffic received from the guest to a file.
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@option{path} specifies the path of the file to be opened. This file will be
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created if it does not already exist, and overwritten if it does. @option{path}
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is required.
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@item -chardev pipe ,id=@var{id} ,path=@var{path}
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Create a two-way connection to the guest. The behaviour differs slightly between
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Windows hosts and other hosts:
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On Windows, a single duplex pipe will be created at
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@file{\\.pipe\@option{path}}.
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On other hosts, 2 pipes will be created called @file{@option{path}.in} and
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@file{@option{path}.out}. Data written to @file{@option{path}.in} will be
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received by the guest. Data written by the guest can be read from
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@file{@option{path}.out}. QEMU will not create these fifos, and requires them to
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be present.
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@option{path} forms part of the pipe path as described above. @option{path} is
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required.
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@item -chardev console ,id=@var{id}
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Send traffic from the guest to QEMU's standard output. @option{console} does not
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take any options.
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@option{console} is only available on Windows hosts.
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@item -chardev serial ,id=@var{id} ,path=@option{path}
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Send traffic from the guest to a serial device on the host.
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@option{serial} is
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only available on Windows hosts.
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@option{path} specifies the name of the serial device to open.
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@item -chardev pty ,id=@var{id}
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Create a new pseudo-terminal on the host and connect to it. @option{pty} does
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not take any options.
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@option{pty} is not available on Windows hosts.
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@item -chardev stdio ,id=@var{id}
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Connect to standard input and standard output of the qemu process.
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@option{stdio} does not take any options. @option{stdio} is not available on
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Windows hosts.
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@item -chardev braille ,id=@var{id}
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Connect to a local BrlAPI server. @option{braille} does not take any options.
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@item -chardev tty ,id=@var{id} ,path=@var{path}
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Connect to a local tty device.
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@option{tty} is only available on Linux, Sun, FreeBSD, NetBSD, OpenBSD and
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DragonFlyBSD hosts.
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@option{path} specifies the path to the tty. @option{path} is required.
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@item -chardev parport ,id=@var{id} ,path=@var{path}
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@option{parport} is only available on Linux, FreeBSD and DragonFlyBSD hosts.
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Connect to a local parallel port.
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@option{path} specifies the path to the parallel port device. @option{path} is
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required.
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@end table
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ETEXI
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DEFHEADING()
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DEFHEADING(Bluetooth(R) options:)
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DEF("bt", HAS_ARG, QEMU_OPTION_bt, \
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"\n" \
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"-bt hci,null dumb bluetooth HCI - doesn't respond to commands\n" \
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"-bt hci,host[:id]\n" \
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" use host's HCI with the given name\n" \
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@ -1097,7 +1326,6 @@ DEF("bt", HAS_ARG, QEMU_OPTION_bt, \
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"-bt device:dev[,vlan=n]\n" \
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" emulate a bluetooth device 'dev' in scatternet 'n'\n")
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STEXI
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Bluetooth(R) options:
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@table @option
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@item -bt hci[...]
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@ -1206,8 +1434,6 @@ STEXI
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@table @option
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ETEXI
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DEF("chardev", HAS_ARG, QEMU_OPTION_chardev, \
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"-chardev spec create unconnected chardev\n")
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DEF("serial", HAS_ARG, QEMU_OPTION_serial, \
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"-serial dev redirect the serial port to char device 'dev'\n")
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STEXI
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